Safety appliance for presses and other machines.



APPLICATION TILED NOV. 23,1908.

Patented Apr. 26, 1910.

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" AZZorzzegs 21a. r/ML J. T. RONAN. I SAFETY APPLIANCE FOR PRESSES AND OTHER MACHINES.

APPLICATION FILED NOV. 23, 1909 Patented Apr. 26, 1910. v

2 SHEETS-SHEET 2.

lzz ornegi JOHN T. ROWAN, 01f BUFFALO. NEW YORK.

SAFETY APPLIANCE FOR PBESSES AND OTHER MAOHINES.

Specification of Letters Intent.

Patented Apr. 26, 1910.

Application filed. November 23, 1908. Serial No. 464,180.

To all whom it may concem:

Be it known that I, JOHN '1. Ronnie, a citizen of the United States, resldm at Buffalo, in thecounty of Erie and tate of New York, have invented a new and useful Improvement in Safety Apfphances for Presses and other Machines, 0 which the following is a specification.

The object of this invention. is to rovide a safety appliance for blanking, ormmg and other presses and analogous manuallycontrolled power driven machines, which will make it necessary for the operator to use both of his hands at points distant from the plunger, or other power-operated part of the machine, to start the machine, thus positively preventing injury to the operators hands.

Another object of the invention is to pro vide a safety appliance of simple and practical construction which can be made and applied to machines at small expense, and which will not materially increase the labor of operating the machine-nor prevent the rapi operation thereof.

In the accompanying drawings, consisting of two sheets: Figure 1 is a fragmentary pcrs ective view of a press equipped with a saiety appliance embodying the invention. Fig. 2 is a fragmentary perspective view, on an enlarged scale, of the stop device for the plunger and its hand-actuating means. Fig. 3 is a fragmentary sectional elevation of the press, showing the plunger raised and the stop device in position to prevent the movement of the plunger. Fig. 4 is a similar view, showing the plunger lowered. Fig. 5 is a fragmentary front elevation, partly in section, of the treadlc latch and its operatin means.

ike letters of reference refer to like parts in the several figures.

A represents the frame, B the stationary die. and C the reciprocating plunger of a power-driven press. The plunger is reciprocated by an eccentric or crank shaft D which is driven by a continuously running pulley E through the medium of an auto matic stop clutch F controlled by u startiug treadlc G and a throwout device connected to and o erated by the trcadle. The construction an operation of presses of this sort are well known. When the starting treadle is depressed the clutch is released and connects the crank shaft to the drive pulley so that the shaft is driven and reciprocates the plun er. Then the treadle is released the clutc actuates automatically to disconnect the crank shaft from the drivin pulley and stop the shaft in position to h o d the plunger in its raised or rest posit-ion.

The safety appliance comprises a stop device H which is movably mounted on the press and prevents the plunger from descending from its raised or rest position unless the stop device is first moved from its holding position, and a latch or bolt I which prevents the starting treadle from being depressed to start the machine unless the latch is first'retracted. The stop device and latch are operated by separate handles 01- devices located so that they can only be actuated by the operator grasping one with one hand and the other wlth his other hand.

In the construction shown in the drawings, the stop device H consists of a block pivoted at its lower end in any suitable manner on the press bed and adapted to be moved to an upri ht position beneath the plunger C, when 1e latter is raised, by a spring l1. arranged between the block and a stationary post or part it on the press bed in rear of the block.

K is a push rod which extends fore and aft of the press at one side thereof and is slidably mounted in a suitable guide or frame is secured on the press bed. The push rod is provided at its front end with a bandle 11: and is connected at its rear end to one end of a lever is which extends across the rear rtion of the press in front of the stop bloc: H and is pivoted at its other end in any suitable manner to the press bed. Each time the press plunger is raised the spring it throws the sto block I-l forwardly to an upright position beneath the )lungcr and holds the push rod K in its orwurd position, as shown in F i 3, and the plungcr cannot descend until the stop block is swung rcarwardly from beneath the plungcr, as shown in Fig. 4, by shoving the push rod K rearwardly.

The treadlc latch I consists of a bolt which is slidably mounted in a suitable frame of guide 2 secured on the lower portion of the press frame adjacent to the treadlc, and IS projected inwardl beneath the trcadlc when the latter is raise by a suitable spring l M represents a hand lever for operating the latch I. The lever is fulcrumed on a bracket m risin from the latch frame, is connected at its ower end to the latch bolt and is provided at its upper end with a handle m which is located at the opposite side of the press from the dpush rod K within easy reach of one ban of the operator. A bolt m secured to the upper portion of the lever M and passing through a slot m in a plate m secured to the press frame su pports the upper end of the ever and limits the throw thereof. Whenever the starting treadle G returns to its raised normal position after being depressed to start the press, the spring Z projects the inner end of the latch bolt beneath the treadle and prevents it from being a ain depressed without first moving the ban lever M to retract the bolt. Thus the trcadlc cannot be depressed to start the machine without first moving the hand lever M to release the treadle and the plunger cannot then descend unless the push rod K is operated to move the stop block from beneath the plunger. After the work has been placed 1n position beneath the plunger, the operator must therefore grasp and o crate both the push rod K and the latch lever M before the lungcr can be caused to descend, and as th hands are required to do this it is imposslble for either hand to he beneath the plunger when t descends, so that injury to the hands is positively prevented. If the operator should inadvertently operate the latch lever and dc press the treadle without actuating the ash rod K, the plunger could not descen on account of the stop block H being beneath it, and the drive hell; would slip on the pul ley E, thus permitting the crank shaft to remain stationary. Thelatch lever and push red are referably located as shown, at op posite sidhs of the front portion of the press, where they are Within eas reach of the operators hands and can e o erated togcther quickly and with but litt G B? 1ll-10IL the app iance described, a sliding rod is employed at one side of the machine for moving a stop out of the path of the plunger, and a lever at the other side for movmg a latch out of engagement with the starting treadle of the press. This construction is simple and eiiicient, but the invention is not restricted to such construction. for manifestly other sorts of hand-actuated parts could be used for operating a plunger stop and treadle latch of the construction shown or of other construction, or other parts cooperating with operative )arts of the machine for accomplishing simi ar ends, the essential idea of the invention being the employment of two hand-actuated devices which must be operated to start the machine and which are so located and associated that both of the operators hands are required to operate them.

I claim as my invention:

1. The combination with a power-operated machine, of means which normally prevent the operation of the machine, and independent mechanical hand devices for operating said means, which devices are separated so that both hands are required to operate them and which must be moved at substantialli, the same time to actuate said means to a low the machine to he started, substantially as set forth.

2. The combination with a ogous machine of se arate an independent devices each of whic normally prevents the operation of the machine and must be actuated to start the machine, and separate operating handles for said devices which are arranged at a distance apart so that both of the operators hands are required to actuate said handles, substantially as set forth.

3. The combination with a machine having a power-operated part, and a starting device therefor, of a stop device which normally prevents the operative movement of said power-operated part, a latch which normally prevents the actuation of said starting device, and separate handles for moving said stop device and said latch to release the parts controlled thereby, substantially as set forth.

4. The combination with a machine having a reciprocating plunger, and a starting device therefor, of a latch which normally holds said starting device from movement, a stop device which normall revents the operative movement of said p unger, and separate hand-o crating devices connected to said latch an stop device for actuating the same, substantially as set forth.

5. The combination of a machine having a reciprocating plunger, and a starting treadle therefor, of a latch for said treadle, a stop device which is normally held in the path of said plunger, and separate handoperating devices for said latch and stop device arranged at opposite sides of the machine within reach of the operators hands, substantially as set forth.

' The combination of a machine having a reciprocating plunger, and a starting treadle therefor, of a latch for said trcadlc, a stop block movably mounted on said machine, means for normally holding said stop block in the path of said plunger, :1 handoperating device at one side of the machine for moving said stop block out of the iath of said plunger, and a separate hand-0perating (evice at the opposite side of the machine for moving said latch to release said treadle, substantially as set forth.

7. The combination of a machine having a.

ress or analreciprocating plan 613M111 pawl-ting treadle w release said treadle, substantially as set 10 therefor, of a la-tocv for smd tyeadle, a stop forth.

block movably mounted on sand machine, a Witness my hand, this 17th day of Nospring for moving said she block into the vember, 1908.

path of said plunger a pas rod at one side of the machine and zaonnecuons for movin JOHN RONA-N said stop block out of the path of sai Witnesses:

plunger, and a hand lever at the o posite G. \V. PARKER,

side of the machine for moving sai latch C. B. Honunncx. 

